Should be able to remove the big nut and slide off the yoke. Then just pry out the seal and carefully tap the new one in with a small hammer, working in a circular motion with your tapping. Then torgue the nut back to specs after slipping the yoke back on, but make sure to apply a little dab of wheel bearing grease to the rubber seal lip before assembly of the yoke and nut. Don't remove the 4 bolts, from what I remember, as that would allow the removal of the pinion itself? If you torgues it right back to specs without going to tight, you won't disturb the cruch sleeve "setting" as it takes a lot of torque to "squeeze" it down. Hope this helps, and good luck